Study of molecular motion by 1H NMR relaxation in ferroelectric LiH3(SeO3)2, Li2SO4·H2O, and LiN2H5SO4 single crystals

Title & Authors
Study of molecular motion by 1H NMR relaxation in ferroelectric LiH3(SeO3)2, Li2SO4·H2O, and LiN2H5SO4 single crystals
Park, Sung Soo;

Abstract
The proton NMR line widths and spin-lattice relaxation rates, $\small{T_1^{-1}}$, of ferroelectric $\small{LiH_3(SeO_3)_2}$, $\small{Li_2SO_4{\cdot}H_2O}$, and $\small{LiN_2H_5SO_4}$ single crystals were measured as a function of temperature. The line width measurements reveal rigid lattice behavior of all the crystals at low temperatures and line narrowing due to molecular motion at higher temperatures. The temperature dependences of the proton $\small{T_1^{-1}}$ for these crystals exhibit maxima, which are attributed to the effects of molecular motion by the Bloembergen - Purcell - Pound theory. The activation energies for the molecular motions of $\small{^1H}$ in these crystals were obtained. From these analysis, $\small{^1H}$ in $\small{LiH_3(SeO_3)_2}$ undergoes molecular motion more easily than $\small{^1H}$ in $\small{LiN_2H_5SO_4}$ and $\small{Li_2SO_4{\cdot}H_2O}$ crystals.
Keywords
Ferroelectrics;Crystal growth;Nuclear magnetic resonance;Ferroelectricity;Crystal growth;Nuclear magnetic resonance and relaxation;
Language
English
Cited by
1.
Slow ion exchange in crystalline Li 2 SO 4 ⋅H 2 O: A 6 Li 2D EXSY NMR investigation, Solid State Ionics, 2017, 304, 60
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